Measurements; Voltage Drop Across Pe Conductor / Resistance Of Pe Conductor; Measurement Principle - LEM MachineTest 204 Manuel D'utilisation

MEASUREMENTS

4 MEASUREMENTS

4.1 Voltage drop across PE conductor / resistance of PE conductor

Measurement principle

230 V
50 Hz
Fig. 06. Voltage drop / resistance measurement principle
Rt.l. ......... test lead resistance
Result in voltage drop measurement is given in (V) and is scaled to test current of 10 A.
Result in resistance measurement is given in (Ω).
Warnings!
• Make sure tested object to be disconnected from mains voltage!
• Do not apply any external voltage to test terminals, internal fuse
may be blown and the instrument may be damaged! (Instrument is
protected against extraneous overvoltage up to 250 V AC)
• Make sure contact between test tips (alligator) and tested object to
be good (remove oxide or colour at the surface of tested object
before carrying out the test)!
• Compensate resistance of test leads before carrying out the test!
Test procedure
STEP 1 Prepare the instrument
Place it into such position that both test points of tested object will be
-
reachable by the test tips (take into account the 2 m long test leads) or
use optional test lead extensions.
Connect the instrument to mains voltage via mains cord.
-
- Connect test leads to terminals of the instrument.
Select U
-
Switch on the instrument, initial display state is present (- - -).
-
A
11 V
Fuse
Rint. Fuse
Rint.
function setting rotary switch to U
or R
PE PE
Rt.l.
_
∼
V
Rt.l.
+
∼
10
L1
L2
L3
N
PE
S = 4 mm (example) 2
PE collector
or R
PE PE position.